Lowering Kitchen Drain

[Leungw]

Hello all. I am looking for advice on properly lowering the drain in my kitchen. It's about 24" off the floor now. We are getting a 10" deep sink with a garbage disposal. I believe the drain should be about 16" high.

Attached picture shows how the drains are set up. All are 2" pipes. The right side goes to the washer, about 4ft away. The left goes to the kitchen sink, also about 4ft away. I need to lower the kitchen sink drain to where the washer drain is. Would a double san-tee work in this case? Or do I have to split up the vertical vent into two, with each one picking up a drain?

Thank you in advance.

 

[Gagecalman]

Is this what you're thinking?

 

[Sponsor]

 

[Leungw]

Is this what you're thinking?

Yes. I read about this approach on other threads with similar questions.

Those threads also mention double san tee, double fixture tee, etc. The correct approach seems to be dependent on what the actual fixtures are. That's why I wanted to ask whether a double san tee could be used in this case.

Thank you.

 

[wwhitney]

NJ has an uncommon plumbing code, the NSPC, so you'd have to check it for a definitive answer. But generally a double fixture fitting would be fine. Snaking through it and exiting the bottom can be difficult, I hear, so a cleanout below might be wise.

Cheers, Wayne

 

[Leungw]

Thank you Wayne.

Would branching out the vertical vent also work (like picture below)? If so, which approach is better? Thank you again.

 

[Terry]

The advantage of the green layout, is that both sides are vented, and when snaking, it follows the drain pathway and doesn't cross over into the other drain.
This was mocked up with 1.5" for work on a remodel where there was only one sink to begin with. Current code is 2" for two lavs or sinks. Way better though than a double cross. What a pain that would be to snake on 1.5"
You have 2" now, so that's not an issue.
A 2" double fixture cross would also work, with the cleanout above it on the vent side. That way, where the two drains come together, that can be snaked too.

 

[Leungw]

Understood. Thank you very much!